Abaixo está uma instrução que descreve uma tarefa de geração de SQL, combinada com uma entrada que fornece mais contexto sobre os esquemas de tabela disponíveis. Escreva o código SQL que responda adequadamente à solicitação
 ###Instrução: Quantos clubes restaram na rodada preliminar?
 ###Tabelas: CREATE TABLE teams (teams_id AUTO_INCREMENT PRIMARY KEY, Round VARCHAR, Clubs remaining INT, Clubs involved INT, Winners from previous round VARCHAR, New entries this round VARCHAR, Leagues entering at this round VARCHAR) CREATE TABLE federal_election_results (federal_election_results_id AUTO_INCREMENT PRIMARY KEY, Election INT, # of candidates nominated INT, # of seats won INT, # of total votes INT, % of popular vote VARCHAR) CREATE TABLE list_of_yachts (list_of_yachts_id AUTO_INCREMENT PRIMARY KEY, Hull No. INT, Year INT, Project VARCHAR, Length overall in meters (without bowsprit) INT, Name VARCHAR, Destination VARCHAR) CREATE TABLE winners_knockout (winners_knockout_id AUTO_INCREMENT PRIMARY KEY, Home (1st leg) VARCHAR, Home (2nd leg) VARCHAR, 1st Leg VARCHAR, 2nd leg VARCHAR, Aggregate VARCHAR) CREATE TABLE spring_1998 (spring_1998_id AUTO_INCREMENT PRIMARY KEY, 7:30 am VARCHAR, 8:00 am VARCHAR, 9:00 am VARCHAR, 11:00 am VARCHAR, noon VARCHAR, 12:30 pm VARCHAR, 1:00 pm VARCHAR, 1:30 pm VARCHAR, 2:00 pm VARCHAR, 3:00 pm VARCHAR, 3:30 pm VARCHAR, 5:00 pm VARCHAR, 6:30 pm VARCHAR)  
SELECT Clubs remaining FROM teams WHERE Round = Preliminary round